A man already charged with suffocating a southwest Missouri teen during sex and dumping her body in Truman Lake has been charged with another death, authorities announced Wednesday.

Anthony Balbirnie, who was charged last month with second-degree murder and other charges in the September 2012 killing of 15-year-old Khighla Parks of Willard, also faces charges in the death of Theresa Mohler, Missouri Attorney General Chris Koster and the Missouri State Highway Patrol said. The AG and patrol also announced that another man, 40-year-old Larry L. Warner, of Springfield, is charged in Parks' death.

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Authorities said Mohler, 31, of Springfield, was held against her will for several days in August 2008 at Balbirnie's Polk County home, where she was forcibly injected with methamphetamine and raped. Although she escaped, the injection was blamed for causing a deadly infection, the patrol said.

An indictment handed down by a Polk County grand jury charges Balbirnie with second-degree murder, rape, sodomy and assault in the Mohler case. Balbirnie is incarcerated at the state prison in Bowling Green, where he is serving time for violating parole. The Missouri State Public Defender Office didn't immediately return a message from The Associated Press.

Balbirnie, 48, of Springfield, also is one of three people charged in Parks' death. Warner, the latest defendant to be charged, was picked up Tuesday and is jailed in Dallas County on $500,000 bond on charges of second-degree murder, conspiracy to commit statutory sodomy and child endangerment, patrol Sgt. Jason M. Pace said.

The criminal complaint against Warner said he took the victim, identified in the document only as K.P., from Greene County to Dallas County in September 2012 to "engage in asphyxiation sex" with Balbirnie. Pace said K.P. is Parks.

The third suspect in Parks' death, Amy Leigh Hartley, of Buffalo, is jailed in Benton County on $75,000 bond on charges of statutory sodomy, tampering with physical evidence and abandonment of a corpse. The complaint shows she also is charged with endangering the welfare of a child by allowing the teen in her "uninhabitable" home, where methamphetamine was made and used "to engage in sex with multiple partners, some of whom were known by the defendant to engage in asphyxiation sex."

After the girl's September 2012 death, Hartley helped move the body and wash bedding to thwart investigators, according to the complaint. Her attorney, Charles Ankrom, didn't immediately return a phone call.

Pace said the investigation into the two deaths is ongoing and that authorities are encouraging people with information about either case to come forward.